The objective of this paper is to investigate the complete process of dynamic crack propagation in brittle materials under different loading rates. By using Improved Single Cleavage Semi-Circle (ISCSC) specimens and Split Hopkinson Pressure Bar equipment. experiments were conducted. with the fracture phenomenon and crack propagation of tight sandstone investigated. https://www.markbroyard.com/hot-offer-greenery-gatefold-wedding-invitations-discount-mega-find/